Method of and apparatus for detaching sheets of paper of uniform length



I LENGTH Feb. 4, 1930. 'x. DAMBACHER METHOD OF AND APPARATUS FOR DETACHING SHEETS OF PAPER 015 UNIFOR Filed Dec. 28, 1928 IQN 7 \am m E T E :1 E v, I I R .w w

Patented Feb. 4,1930

UNITED STATES PATENT OFFICE X AVER DAMBACIFIER, F LlhlNGERIGH/WESTPHALIA} GERMANY, ASSIGNOR TO THE FIRM WIKDMOLLER & HOLSCHER, G. M. B. BL, OF LENGERICH/WESTIPHALIA, GER- MANY mnrrron or AND APPARATUS non nn'raonme snnnrs or PAPER or UNIFORM LENGTH 1 Application filed December 28, 1928, Serial No. 328,917 and in Germany February 6, 1928.

The invention relates'to the detaching of sheets of paper of uniform length from a plurality of paper webs in such manner that the edges of the separate sheets, situated transversely in, relation to the direction of the webs, are relatively offset stepwise. 1

According to the'invention, the paper webs are divided up into the deslred lengths by means of. rows of perforations or equivalent (hereinafter termed weakening lines) runmng crosswise of the direction of the webs,

and the webs thus prepared are fed conjointly througha pair of draft rollers in such man ner that the weakening lines are superimposed stepwise after which the webs are torn-off or separated along the weakening lines.

The usual cutting and detaching mechan1sm is replaced by a pair of tearing rollers running at a higher speed than the aforesaid draft rollers. By this means, the coming into action'of'the tearing rollers exerts a pull or jerk on the paper webs in the longitudinal direction of same, so as to tear off the lengths I or sheets from the paper webs along the staggered weakening lines.

A typical embodiment of the invention is illustrated diagrammatically on the accompanying drawing, on which Fig. 1 is a side elevation; and Fig. 2 is a plan .of the perforated paper web and of the position of the paper detached in accordance with the new method.

Th paper webs 1 2: 3' coming from the reels 1: 2:3, are passed through pairs of perforating cylinders 4 and 5: 6 and 7:8 and 9, being thus provided with lines of perforations 1" 2" :3. The webs are then led over guide rollers-1O and.11 and passed conjointly between draft rollers 12 and 13, the feed being arranged so that the weakening lines 1:2":3" produced by'the rollers 4 and 5 etc.,' assume the relatively stack-shaped or stepwise positions shown in Fig. 2. From the draft rollers, the paper webs are fed to tearing rollers 17 and 18, the upper roller 18 of which is mounted in a pair of levers 14 and 15 .16. These tearing rollers 17 and 18have'a higher peripheral velocity than the draft rollers 12 and 13 so that, when the upper roller 18 comes into touch with the lower roller paper, disposed in stepwise manner, from a' and is moved up and down by an eccentric producing sheets of paper, disposed in stepwise manner, from a plurality of webs, consisting in marking off the webs into the desired lengths of sheet by transverse weakening lines, then feeding the webs conjointly so that the weakening lines of the different webs are relatively offset stepwise, and'thereafter subjecting the webs toa tensioning action to separate the sheets along said weakening lines.

2. A machine for producing sheets of paper, disposed in stepwise manner, from a plurality of paper webs, comprisinga plurality of reel supports; means for marking off the webs into the desired lengths of sheet while being fed from the reels; guide rollers arranged to bring the webs into superimposition with the weakening lines offset stepwise; means for feeding the webs, and tensioningimeans acting inconjunction with the last recited means to separate the sheets along said weakening lines.

I 3. A machine for producing sheets of plurality of paper webs, comprising a plurality 0f reel supports, means for marking off the webs .into the desired lengthsof sheet while being fed from the reels, guide rollers and draft rollers arranged to bring the webs into superimposition with the weakening lines offset, tensioning means for separatin the sheets along the weakening lines, an means for operating the aforesaid means and draft rollers.

4. A machine for producing sheets 'of paper, disposed in stepwise manner, from a plurality of 'paper webs, comprising a plurality of reel support-s, perforating rollers for marking off the webs into the desired lengths of sheet by rows of transverse perforations while being fed from the reels, guide rollers arranged to bring the webs into superimposition with their perforations relativel offset tensioning means acting in conjunction with the last recited means to separate the sheets along said perforations.

I 5. A machine, for producing sheets of 5 paper, disposed in stepwise manner, from a plurality of paper webs, comprising a plurality of reel supports, perforating rollers for marking off the webs into the desired lengths of sheet by rows of transverse perforations while being fed from the reels, guide rollers and draft rollers arranged to bring the webs into superimposition with their perforations relatively offset stepwise, tensioning means for separating the sheets along the perforations, and means for operating the aforesaid perforating rollers, draft rollers and tensioning means.

6. In the method of mechanically producing sheets of paper, disposed in stepwise re lation, from a plurality of webs having transverse weakening lines defining the several sheets, the step which consists in conjointly feeding the webs with the weakening lines of theseveral Webs in relatively ofi'set relation before detaching the sheets.

7. In the method of mechanically producing sheets of paper, disposed in stepwise re lation, from a plurality of webs having trans verse weakening lines defining the several sheets, the steps which consist in conjointly' feeding the webs with the weakening lines of the several webs in relatively offset relation,

and simultaneously detaching corresponding sheets of the several webs by tension.

In testimony whereof I have aifixed my signature.

XAVER DAMBACHER. 

